09 Jul 2025, 17:09 [ UTC - 5; DST ]
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Post subject: Re: LOP for Lycoming powered Piper Malibu/M350? Posted: 27 Aug 2020, 15:36 |
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Joined: 03/15/16 Posts: 672 Post Likes: +365 Location: Charlotte NC
Aircraft: Piper Mirage
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It depends on each individual engine. Mine won’t.
Val
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Post subject: Re: LOP for Lycoming powered Piper Malibu/M350? Posted: 27 Aug 2020, 15:49 |
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Joined: 09/01/10 Posts: 420 Post Likes: +54 Company: Tarheel Aero Tech Location: Concord, NC (JQF)
Aircraft: 2003 Bonanza A36
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I've never tried running my PA-350P LOP in my 2012 Mirage. The Lycoming Manual for the TIO-540-AE2A says not to run this engine LOP.
The Piper Manual for the airplane says at cruise power, run the TIT at peak, For engine longevity Lycoming says to keep the TIT below 1600 degrees F.
I keep my TIT temperature below 1600 F and I keep my cylinder head temps below 380 F.
So far I'm very pleased with this airplane and the performance.
_________________ ATP, ASEL/ASES/AMEL, CFI, CFII, MEI, IGI, DPE(PE, CIRE, ATPE, FIE, FIEI) Gold Seal Flight Instructor
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Post subject: Re: LOP for Lycoming powered Piper Malibu/M350? Posted: 27 Aug 2020, 21:14 |
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Joined: 03/15/16 Posts: 672 Post Likes: +365 Location: Charlotte NC
Aircraft: Piper Mirage
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Cylinder data lags behind tit data by about 6-10 minutes. So I wouldn’t rely on that.... also remember that are two turbo chargers so TIT is only on one turbo and the variation is up to 80° between them. 1600° may be max but which one?!? It’s a slippery slope unless you know exactly what you’re doing
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Post subject: Re: LOP for Lycoming powered Piper Malibu/M350? Posted: 27 Aug 2020, 21:30 |
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Joined: 05/29/10 Posts: 3950 Post Likes: +1103 Company: Advanced Pilot Seminars Aust. Location: Brisbane Qld Australia
Aircraft: RV-10....ssshhh!
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Username Protected wrote: Cylinder data lags behind tit data by about 6-10 minutes. So I wouldn’t rely on that.... also remember that are two turbo chargers so TIT is only on one turbo and the variation is up to 80° between them. 1600° may be max but which one?!? It’s a slippery slope unless you know exactly what you’re doing Val, I think you are confused.  Let me clarify I said using cylinder data not TIT data......that means exhaust gas temperatures at each cylinder not exhaust gas temperature at the turbo inlet. And no, it does not lag at all, it actually leads the TIT by a second or two  And yes all dual turbo systems have a discrepancy between TIT's. Which is why I find it easier to use the raw data EGT by cylinder just like you would in a NA plane, and not use the lean find. You assumed I meant using CHT, and yes that lags several minutes and is a very dumb idea as you suggest. Quote: It’s a slippery slope unless you know exactly what you’re doing My slippery slope is a pretty flat and high grip surface these days  (some will get the humour, and I am not making fun of you Val, for some others your concern would be appropriate) Hope that clears that up.
_________________ David Brown
The two best investments you can make, by any financial test, an EMS and APS!
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Post subject: Re: LOP for Lycoming powered Piper Malibu/M350? Posted: 28 Aug 2020, 21:21 |
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Joined: 03/15/16 Posts: 672 Post Likes: +365 Location: Charlotte NC
Aircraft: Piper Mirage
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Sorry David. I thought when you said cylinder data you meant CHT. My bad.
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